...in the field, but which is represented to be a much older formation, preexisting as the surface rock before the Huronian sediments began to form, while,...surface after the Huronian beds were already formed." Referring to the discordances between these two systems, frequently alleged by the Canadian geologists,...

...which is represented to be a much older formation, preexisting as the surface rock before the Huroniau sediments began to form, while, according to my own...surface after the Huronian beds were already formed." Referring to the discordances between these two systems, frequently alleged by the Canadian geologists,...

...succeseional and structural relations of the series, he continues : "By their eruption, [the granitic rocks] caused not only the great dislocations of the Huronian formation, but the half molten, plastic granite mass induced by their contact with the Huronian rockbeds, also their alteration...